############################################################
# print('start')
# while 1 > 2:
#     print('喝干这碗家乡的酒，壮士一去不复返。')
# print('stop')
############################################################
# print('start')
# flag = True
# while flag:
#     print('滚滚黄河，滔滔长江。')
#     flag = False
# print('stop')
############################################################
# print('start')
# num = 1
# while num < 3:
#     print('滚滚黄河，滔滔长江。')
#     num = 5
# print('stop')
############################################################
# print('start')
# num = 1
# while num < 5:
#     print('给我生命，给我力量。')
#     num = num+1
# print('stop')
############################################################
# print('start run os')
# flag = True
# while flag:
#     user = input('please enter user name:')
#     pwd = input('please enter possword:')
#     if user == 'wupeiqi' and pwd == 'oldboy':
#         flag = False
#     else:
#         print('user name or possword error,please log in again')
#print('stop os')
############################################################
# number = 66
# flag = True
# while flag:
#     user_num = input('please enter number:')
#     user_enter_num = int(user_num)
#     if user_enter_num > number:
#         print('The enter number is too big')
#     elif user_enter_num < number:
#         print('The input number is too small')
#     else:
#         print('happy,crrect answer')
#         flag = False
############################################################
# num=0
# while num<100:
#     if num%2==0:
#         print(num)
#     num+=1
############################################################

